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Two new miniature metallic sealed-cells containing the triple point of water, WTP (273.16 K) and the triple point of mercury, HgTP (234.3156 K) have been constructed for the realization of the International Temperature Scale of 1990 (ITS-90) at the National Institute of Standards (NIS-Egypt). The two new cells, in addition to a previously realized argon and oxygen triple point cells, will provide facilities for the calibration of capsule-type standard platinum resistance thermometers (CSPRTs) at one single run. Many phase transition plateaux were carried out and compared to the laboratory large reference cells using the same thermometers in order to test the performance of the new cell.

Performance of Water and Mercury Triple Points Reference Cells under Adiabatic Conditions